Answer
$z=-45$
Work Step by Step
$-1+(-8)=\frac{x}{5}$ $\longrightarrow$combine like terms
$-9=\frac{x}{5}$ $\longrightarrow$multiplication property
$-9\times5=\frac{x}{5}\times5$ $\longrightarrow$simplify
$-45=z$
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